Came across this compiled data on Ford Heads. I believe most of the data is from automotive magazines and the newest data is from 2005. Enjoy.
Some good comparison information on both stock and aftermarket heads - thanks for posting ....... I'll make it a sticky so it is easy to find when needed.
Thatbis some good info. Looks like my Y303 SVO heads suck compared to the aftermarket! Even the standard performer heads outflow them.